schmitt trigger oscillator

[flashlaser]

Hi,
I just wanted to know how to calculate the valves of the resistor and capacitor to make a 1Hz oscillator. If someone could give me the result it would be nice.

Thanks

 

[kinjalgp]

Is your oscillator 555 based or BJT based?

 

[Chippie]

How accurate do you want the 1Hz to be in terms of time?

Might be better to generate a faster signal and divide it down to get the accuracy if needed

 

[klbullard]

Hi,
I just wanted to know how to calculate the valves of the resistor and capacitor to make a 1Hz oscillator. If someone could give me the result it would be nice.

Thanks

The frequency formula is:

F= (1.2)(10^6)/RC

This is a nice web page with everything you ever wanted to know about a schmitt trigger.

TALKING ELECTRONICS BEC Page 49